linux-kernel - Re: [xfs-masters] linux-next: manual merge of the xfs tree with Linus' tree

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Date:	Mon, 28 Mar 2011 12:58:09 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Christoph Hellwig <hch@....de>
CC:	Stephen Rothwell <sfr@...b.auug.org.au>,
	David Chinner <david@...morbit.com>,
	"xfs-masters@....sgi.com" <xfs-masters@....sgi.com>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [xfs-masters] linux-next: manual merge of the xfs tree with 
 Linus' tree

On 2011-03-28 12:53, Christoph Hellwig wrote:
> On Mon, Mar 28, 2011 at 12:47:53PM +0200, Christoph Hellwig wrote:
>> What XFS does is to replace blk_run_address_space, which was a wrapper
>> around blk_run_backing_dev with a direct call to blk_run_backing_dev,
>> as there change means we don't have the address_space around anymore.
>>
>> Jens' tree removes both these functions, and introduces blk_flush_plug
>> as a sort-of replacement.  Sticking to the variant from Jens' tree / mainline
>> with blk_flush_plug is the correct thing here for this case.
>>
>> Where there more conflicts than just this?
> 
> Actually I think we can remove some calls alltogether:  the on-stack
> plugging already flushes the plug queue when context switching,
> which we'll always do in xfs_buf_wait_unpin, and if we get the lock
> without blocking in xfs_buf_lock we don't need to unplug either.

Yes, in fact all of the blk_flush_plug() calls in XFS can just go away
now. I tried to keep them for clarity, but they are primarily there
since XFS was the first conversion/testing I did back when it was hacked
up.

-- 
Jens Axboe

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